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path: root/fs/ocfs2/dlm/dlmdomain.c
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Diffstat (limited to 'fs/ocfs2/dlm/dlmdomain.c')
-rw-r--r--fs/ocfs2/dlm/dlmdomain.c101
1 files changed, 72 insertions, 29 deletions
diff --git a/fs/ocfs2/dlm/dlmdomain.c b/fs/ocfs2/dlm/dlmdomain.c
index 8f3a9e3106f..ba27c5c5e95 100644
--- a/fs/ocfs2/dlm/dlmdomain.c
+++ b/fs/ocfs2/dlm/dlmdomain.c
@@ -41,7 +41,6 @@
#include "dlmapi.h"
#include "dlmcommon.h"
-#include "dlmdebug.h"
#include "dlmdomain.h"
#include "dlmver.h"
@@ -49,6 +48,33 @@
#define MLOG_MASK_PREFIX (ML_DLM|ML_DLM_DOMAIN)
#include "cluster/masklog.h"
+static void dlm_free_pagevec(void **vec, int pages)
+{
+ while (pages--)
+ free_page((unsigned long)vec[pages]);
+ kfree(vec);
+}
+
+static void **dlm_alloc_pagevec(int pages)
+{
+ void **vec = kmalloc(pages * sizeof(void *), GFP_KERNEL);
+ int i;
+
+ if (!vec)
+ return NULL;
+
+ for (i = 0; i < pages; i++)
+ if (!(vec[i] = (void *)__get_free_page(GFP_KERNEL)))
+ goto out_free;
+
+ mlog(0, "Allocated DLM hash pagevec; %d pages (%lu expected), %lu buckets per page\n",
+ pages, DLM_HASH_PAGES, (unsigned long)DLM_BUCKETS_PER_PAGE);
+ return vec;
+out_free:
+ dlm_free_pagevec(vec, i);
+ return NULL;
+}
+
/*
*
* spinlock lock ordering: if multiple locks are needed, obey this ordering:
@@ -90,8 +116,7 @@ void __dlm_insert_lockres(struct dlm_ctxt *dlm,
assert_spin_locked(&dlm->spinlock);
q = &res->lockname;
- q->hash = full_name_hash(q->name, q->len);
- bucket = &(dlm->lockres_hash[q->hash % DLM_HASH_BUCKETS]);
+ bucket = dlm_lockres_hash(dlm, q->hash);
/* get a reference for our hashtable */
dlm_lockres_get(res);
@@ -100,34 +125,32 @@ void __dlm_insert_lockres(struct dlm_ctxt *dlm,
}
struct dlm_lock_resource * __dlm_lookup_lockres(struct dlm_ctxt *dlm,
- const char *name,
- unsigned int len)
+ const char *name,
+ unsigned int len,
+ unsigned int hash)
{
- unsigned int hash;
- struct hlist_node *iter;
- struct dlm_lock_resource *tmpres=NULL;
struct hlist_head *bucket;
+ struct hlist_node *list;
mlog_entry("%.*s\n", len, name);
assert_spin_locked(&dlm->spinlock);
- hash = full_name_hash(name, len);
-
- bucket = &(dlm->lockres_hash[hash % DLM_HASH_BUCKETS]);
-
- /* check for pre-existing lock */
- hlist_for_each(iter, bucket) {
- tmpres = hlist_entry(iter, struct dlm_lock_resource, hash_node);
- if (tmpres->lockname.len == len &&
- memcmp(tmpres->lockname.name, name, len) == 0) {
- dlm_lockres_get(tmpres);
- break;
- }
+ bucket = dlm_lockres_hash(dlm, hash);
- tmpres = NULL;
+ hlist_for_each(list, bucket) {
+ struct dlm_lock_resource *res = hlist_entry(list,
+ struct dlm_lock_resource, hash_node);
+ if (res->lockname.name[0] != name[0])
+ continue;
+ if (unlikely(res->lockname.len != len))
+ continue;
+ if (memcmp(res->lockname.name + 1, name + 1, len - 1))
+ continue;
+ dlm_lockres_get(res);
+ return res;
}
- return tmpres;
+ return NULL;
}
struct dlm_lock_resource * dlm_lookup_lockres(struct dlm_ctxt *dlm,
@@ -135,9 +158,10 @@ struct dlm_lock_resource * dlm_lookup_lockres(struct dlm_ctxt *dlm,
unsigned int len)
{
struct dlm_lock_resource *res;
+ unsigned int hash = dlm_lockid_hash(name, len);
spin_lock(&dlm->spinlock);
- res = __dlm_lookup_lockres(dlm, name, len);
+ res = __dlm_lookup_lockres(dlm, name, len, hash);
spin_unlock(&dlm->spinlock);
return res;
}
@@ -194,7 +218,7 @@ static int dlm_wait_on_domain_helper(const char *domain)
static void dlm_free_ctxt_mem(struct dlm_ctxt *dlm)
{
if (dlm->lockres_hash)
- free_page((unsigned long) dlm->lockres_hash);
+ dlm_free_pagevec((void **)dlm->lockres_hash, DLM_HASH_PAGES);
if (dlm->name)
kfree(dlm->name);
@@ -278,11 +302,21 @@ int dlm_domain_fully_joined(struct dlm_ctxt *dlm)
return ret;
}
+static void dlm_destroy_dlm_worker(struct dlm_ctxt *dlm)
+{
+ if (dlm->dlm_worker) {
+ flush_workqueue(dlm->dlm_worker);
+ destroy_workqueue(dlm->dlm_worker);
+ dlm->dlm_worker = NULL;
+ }
+}
+
static void dlm_complete_dlm_shutdown(struct dlm_ctxt *dlm)
{
dlm_unregister_domain_handlers(dlm);
dlm_complete_thread(dlm);
dlm_complete_recovery_thread(dlm);
+ dlm_destroy_dlm_worker(dlm);
/* We've left the domain. Now we can take ourselves out of the
* list and allow the kref stuff to help us free the
@@ -304,8 +338,8 @@ static void dlm_migrate_all_locks(struct dlm_ctxt *dlm)
restart:
spin_lock(&dlm->spinlock);
for (i = 0; i < DLM_HASH_BUCKETS; i++) {
- while (!hlist_empty(&dlm->lockres_hash[i])) {
- res = hlist_entry(dlm->lockres_hash[i].first,
+ while (!hlist_empty(dlm_lockres_hash(dlm, i))) {
+ res = hlist_entry(dlm_lockres_hash(dlm, i)->first,
struct dlm_lock_resource, hash_node);
/* need reference when manually grabbing lockres */
dlm_lockres_get(res);
@@ -1126,6 +1160,13 @@ static int dlm_join_domain(struct dlm_ctxt *dlm)
goto bail;
}
+ dlm->dlm_worker = create_singlethread_workqueue("dlm_wq");
+ if (!dlm->dlm_worker) {
+ status = -ENOMEM;
+ mlog_errno(status);
+ goto bail;
+ }
+
do {
unsigned int backoff;
status = dlm_try_to_join_domain(dlm);
@@ -1166,6 +1207,7 @@ bail:
dlm_unregister_domain_handlers(dlm);
dlm_complete_thread(dlm);
dlm_complete_recovery_thread(dlm);
+ dlm_destroy_dlm_worker(dlm);
}
return status;
@@ -1191,7 +1233,7 @@ static struct dlm_ctxt *dlm_alloc_ctxt(const char *domain,
goto leave;
}
- dlm->lockres_hash = (struct hlist_head *) __get_free_page(GFP_KERNEL);
+ dlm->lockres_hash = (struct hlist_head **)dlm_alloc_pagevec(DLM_HASH_PAGES);
if (!dlm->lockres_hash) {
mlog_errno(-ENOMEM);
kfree(dlm->name);
@@ -1200,8 +1242,8 @@ static struct dlm_ctxt *dlm_alloc_ctxt(const char *domain,
goto leave;
}
- for (i=0; i<DLM_HASH_BUCKETS; i++)
- INIT_HLIST_HEAD(&dlm->lockres_hash[i]);
+ for (i = 0; i < DLM_HASH_BUCKETS; i++)
+ INIT_HLIST_HEAD(dlm_lockres_hash(dlm, i));
strcpy(dlm->name, domain);
dlm->key = key;
@@ -1231,6 +1273,7 @@ static struct dlm_ctxt *dlm_alloc_ctxt(const char *domain,
dlm->dlm_thread_task = NULL;
dlm->dlm_reco_thread_task = NULL;
+ dlm->dlm_worker = NULL;
init_waitqueue_head(&dlm->dlm_thread_wq);
init_waitqueue_head(&dlm->dlm_reco_thread_wq);
init_waitqueue_head(&dlm->reco.event);
generated by cgit v1.2.3 (git 2.25.1) at 2024-12-27 15:43:40 +0000